Nature abhors a vacuum, and so do we, even if it's between our ears. You've been given a remarkable organic calculating machine, adept at reasoning and inference, conveniently located on top of your neck. If you don't use it... someone else is likely to.
It is a sad fact of history, and of some other, less reputable disciplines, that when we don't give our brains a bit of excercise they're likely to start listening to ideas that aren't rooted in rationality. Don't let this happen to you! Just a thought or two a day may make all the difference!